| 摘要 |
PROBLEM TO BE SOLVED: To provide a blower motor controlling device for much less power consumption by a thinning control of stopping the output of a PWM driving part for a certain period of time by utilizing force of inertia arising from the rotations of a blower motor. SOLUTION: This device is composed of a microcomputer I, a D-A converter 2, a DC power supply 3, a PWM driver 4, a converter 5, a phase detector 7, and a revolution or 8. The device is provided with an accelerating means 1a that overdrives the blower motor 6 from a steady control state to a high- revolution side; a PWM stopping means 1b that stops the output of the PWM driving part 4 after the overdrive for a certain period of time; and a PWM restarting means 1c that restarts the revolution control by synchronizing it with rotational phase detected by the phase detecting part 7 after the lapse of a certain period of time. Also, a thinning control means 1A is provided that shifts the motor to the thinning control state to perform the thinning control. |
